From: Julia Lawall <julia@diku.dk> To: Joe Perches <joe@perches.com> Cc: walter harms <wharms@bfs.de>, devel@driverdev.osuosl.org, gregkh@suse.de, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] drivers/staging/cx25821: Use kstrdup Date: Mon, 18 Oct 2010 19:44:52 +0200 (CEST) [thread overview] Message-ID: <Pine.LNX.4.64.1010181942570.15744@ask.diku.dk> (raw) In-Reply-To: <1287423539.20968.115.camel@Joe-Laptop> On Mon, 18 Oct 2010, Joe Perches wrote: > Perhaps it's more readable code to recheck the > field name flag and introduce a temporary > char *fname so the slightly unusual reuse of > field = kstrdup(field, GFP) > becomes > field = kstrdup(fname, GFP) Before I had a local variable filename. I preferred that because I felt uneasy about putting both statically and dynamically allocated memory in the same field. But it does mean adding a new local variable. I'm not sure to understand "recheck the field name flag", though. julia > --- > drivers/staging/cx25821/cx25821-audio-upstream.c | 34 +++--------- > .../staging/cx25821/cx25821-video-upstream-ch2.c | 55 +++++++------------- > drivers/staging/cx25821/cx25821-video-upstream.c | 53 +++++++------------ > 3 files changed, 47 insertions(+), 95 deletions(-) > > diff --git a/drivers/staging/cx25821/cx25821-audio-upstream.c b/drivers/staging/cx25821/cx25821-audio-upstream.c > index 27087db..180840f 100644 > --- a/drivers/staging/cx25821/cx25821-audio-upstream.c > +++ b/drivers/staging/cx25821/cx25821-audio-upstream.c > @@ -723,8 +723,6 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) > { > struct sram_channel *sram_ch; > int retval = 0; > - int err = 0; > - int str_length = 0; > > if (dev->_audio_is_running) { > printk(KERN_WARNING "Audio Channel is still running so return!\n"); > @@ -752,28 +750,14 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) > dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER; > _line_size = AUDIO_LINE_SIZE; > > - if (dev->input_audiofilename) { > - str_length = strlen(dev->input_audiofilename); > - dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_audiofilename) > - goto error; > - > - memcpy(dev->_audiofilename, dev->input_audiofilename, > - str_length + 1); > - > - /* Default if filename is empty string */ > - if (strcmp(dev->input_audiofilename, "") == 0) > - dev->_audiofilename = "/root/audioGOOD.wav"; > - > - } else { > - str_length = strlen(_defaultAudioName); > - dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_audiofilename) > - goto error; > - > - memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1); > + if (!dev->input_audiofilename || *dev->input_audiofilename == 0) > + dev->_audiofilename = _defaultAudioName; > + else > + dev->_audiofilename = dev->input_audiofilename; > + dev->_audiofilename = kstrdup(dev->_audiofilename, GFP_KERNEL); > + if (!dev->_audiofilename) { > + retval = -ENOMEM; > + goto error; > } > > retval = > @@ -802,5 +786,5 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) > error: > cx25821_dev_unregister(dev); > > - return err; > + return retval; > } > diff --git a/drivers/staging/cx25821/cx25821-video-upstream-ch2.c b/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > index d12dbb5..fa7cd70 100644 > --- a/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > +++ b/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > @@ -747,10 +747,9 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select, > struct sram_channel *sram_ch; > u32 tmp; > int retval = 0; > - int err = 0; > int data_frame_size = 0; > int risc_buffer_size = 0; > - int str_length = 0; > + char *fname; > > if (dev->_is_running_ch2) { > printk("Video Channel is still running so return!\n"); > @@ -788,39 +787,23 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select, > risc_buffer_size = > dev->_isNTSC_ch2 ? NTSC_RISC_BUF_SIZE : PAL_RISC_BUF_SIZE; > > - if (dev->input_filename_ch2) { > - str_length = strlen(dev->input_filename_ch2); > - dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename_ch2) > - goto error; > - > - memcpy(dev->_filename_ch2, dev->input_filename_ch2, > - str_length + 1); > - } else { > - str_length = strlen(dev->_defaultname_ch2); > - dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename_ch2) > - goto error; > - > - memcpy(dev->_filename_ch2, dev->_defaultname_ch2, > - str_length + 1); > - } > - > - /* Default if filename is empty string */ > - if (strcmp(dev->input_filename_ch2, "") == 0) { > - if (dev->_isNTSC_ch2) { > - dev->_filename_ch2 = > - (dev->_pixel_format_ch2 == > - PIXEL_FRMT_411) ? "/root/vid411.yuv" : > - "/root/vidtest.yuv"; > - } else { > - dev->_filename_ch2 = > - (dev->_pixel_format_ch2 == > - PIXEL_FRMT_411) ? "/root/pal411.yuv" : > - "/root/pal422.yuv"; > - } > + if (dev->input_filename_ch2 && *dev->input_filename_ch2) > + fname = dev->input_filename_ch2; > + else if (dev->input_filename_ch2) { > + /* Default if filename is empty string */ > + if (dev->_isNTSC_ch2) > + fname = (dev->_pixel_format_ch2 == PIXEL_FRMT_411) ? > + "/root/vid411.yuv" : "/root/vidtest.yuv"; > + else > + fname = (dev->_pixel_format_ch2 == PIXEL_FRMT_411) ? > + "/root/pal411.yuv" : "/root/pal422.yuv"; > + } else > + fname = dev->_defaultname_ch2; > + > + dev->_filename_ch2 = kstrdup(fname, GFP_KERNEL); > + if (!dev->_filename_ch2) { > + retval = -ENOMEM; > + goto error; > } > > retval = > @@ -851,5 +834,5 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select, > error: > cx25821_dev_unregister(dev); > > - return err; > + return retval; > } > diff --git a/drivers/staging/cx25821/cx25821-video-upstream.c b/drivers/staging/cx25821/cx25821-video-upstream.c > index 756a820..d51c6c1 100644 > --- a/drivers/staging/cx25821/cx25821-video-upstream.c > +++ b/drivers/staging/cx25821/cx25821-video-upstream.c > @@ -800,10 +800,9 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select, > struct sram_channel *sram_ch; > u32 tmp; > int retval = 0; > - int err = 0; > int data_frame_size = 0; > int risc_buffer_size = 0; > - int str_length = 0; > + char *fname; > > if (dev->_is_running) { > printk(KERN_INFO "Video Channel is still running so return!\n"); > @@ -840,37 +839,23 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select, > risc_buffer_size = > dev->_isNTSC ? NTSC_RISC_BUF_SIZE : PAL_RISC_BUF_SIZE; > > - if (dev->input_filename) { > - str_length = strlen(dev->input_filename); > - dev->_filename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename) > - goto error; > - > - memcpy(dev->_filename, dev->input_filename, str_length + 1); > - } else { > - str_length = strlen(dev->_defaultname); > - dev->_filename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename) > - goto error; > - > - memcpy(dev->_filename, dev->_defaultname, str_length + 1); > - } > - > - /* Default if filename is empty string */ > - if (strcmp(dev->input_filename, "") == 0) { > - if (dev->_isNTSC) { > - dev->_filename = > - (dev->_pixel_format == > - PIXEL_FRMT_411) ? "/root/vid411.yuv" : > - "/root/vidtest.yuv"; > - } else { > - dev->_filename = > - (dev->_pixel_format == > - PIXEL_FRMT_411) ? "/root/pal411.yuv" : > - "/root/pal422.yuv"; > - } > + if (dev->input_filename && *dev->input_filename) > + fname = dev->input_filename; > + else if (dev->input_filename) { > + /* Default if filename is empty string */ > + if (dev->_isNTSC) > + fname = (dev->_pixel_format == PIXEL_FRMT_411) ? > + "/root/vid411.yuv" : "/root/vidtest.yuv"; > + else > + fname = (dev->_pixel_format == PIXEL_FRMT_411) ? > + "/root/pal411.yuv" : "/root/pal422.yuv"; > + } else > + fname = dev->_defaultname; > + > + dev->_filename = kstrdup(fname, GFP_KERNEL); > + if (!dev->_filename) { > + retval = -ENOMEM; > + goto error; > } > > dev->_is_running = 0; > @@ -908,5 +893,5 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select, > error: > cx25821_dev_unregister(dev); > > - return err; > + return retval; > } > > >
WARNING: multiple messages have this Message-ID (diff)
From: Julia Lawall <julia@diku.dk> To: Joe Perches <joe@perches.com> Cc: walter harms <wharms@bfs.de>, devel@driverdev.osuosl.org, gregkh@suse.de, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] drivers/staging/cx25821: Use kstrdup Date: Mon, 18 Oct 2010 17:44:52 +0000 [thread overview] Message-ID: <Pine.LNX.4.64.1010181942570.15744@ask.diku.dk> (raw) In-Reply-To: <1287423539.20968.115.camel@Joe-Laptop> On Mon, 18 Oct 2010, Joe Perches wrote: > Perhaps it's more readable code to recheck the > field name flag and introduce a temporary > char *fname so the slightly unusual reuse of > field = kstrdup(field, GFP) > becomes > field = kstrdup(fname, GFP) Before I had a local variable filename. I preferred that because I felt uneasy about putting both statically and dynamically allocated memory in the same field. But it does mean adding a new local variable. I'm not sure to understand "recheck the field name flag", though. julia > --- > drivers/staging/cx25821/cx25821-audio-upstream.c | 34 +++--------- > .../staging/cx25821/cx25821-video-upstream-ch2.c | 55 +++++++------------- > drivers/staging/cx25821/cx25821-video-upstream.c | 53 +++++++------------ > 3 files changed, 47 insertions(+), 95 deletions(-) > > diff --git a/drivers/staging/cx25821/cx25821-audio-upstream.c b/drivers/staging/cx25821/cx25821-audio-upstream.c > index 27087db..180840f 100644 > --- a/drivers/staging/cx25821/cx25821-audio-upstream.c > +++ b/drivers/staging/cx25821/cx25821-audio-upstream.c > @@ -723,8 +723,6 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) > { > struct sram_channel *sram_ch; > int retval = 0; > - int err = 0; > - int str_length = 0; > > if (dev->_audio_is_running) { > printk(KERN_WARNING "Audio Channel is still running so return!\n"); > @@ -752,28 +750,14 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) > dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER; > _line_size = AUDIO_LINE_SIZE; > > - if (dev->input_audiofilename) { > - str_length = strlen(dev->input_audiofilename); > - dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_audiofilename) > - goto error; > - > - memcpy(dev->_audiofilename, dev->input_audiofilename, > - str_length + 1); > - > - /* Default if filename is empty string */ > - if (strcmp(dev->input_audiofilename, "") = 0) > - dev->_audiofilename = "/root/audioGOOD.wav"; > - > - } else { > - str_length = strlen(_defaultAudioName); > - dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_audiofilename) > - goto error; > - > - memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1); > + if (!dev->input_audiofilename || *dev->input_audiofilename = 0) > + dev->_audiofilename = _defaultAudioName; > + else > + dev->_audiofilename = dev->input_audiofilename; > + dev->_audiofilename = kstrdup(dev->_audiofilename, GFP_KERNEL); > + if (!dev->_audiofilename) { > + retval = -ENOMEM; > + goto error; > } > > retval > @@ -802,5 +786,5 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select) > error: > cx25821_dev_unregister(dev); > > - return err; > + return retval; > } > diff --git a/drivers/staging/cx25821/cx25821-video-upstream-ch2.c b/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > index d12dbb5..fa7cd70 100644 > --- a/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > +++ b/drivers/staging/cx25821/cx25821-video-upstream-ch2.c > @@ -747,10 +747,9 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select, > struct sram_channel *sram_ch; > u32 tmp; > int retval = 0; > - int err = 0; > int data_frame_size = 0; > int risc_buffer_size = 0; > - int str_length = 0; > + char *fname; > > if (dev->_is_running_ch2) { > printk("Video Channel is still running so return!\n"); > @@ -788,39 +787,23 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select, > risc_buffer_size > dev->_isNTSC_ch2 ? NTSC_RISC_BUF_SIZE : PAL_RISC_BUF_SIZE; > > - if (dev->input_filename_ch2) { > - str_length = strlen(dev->input_filename_ch2); > - dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename_ch2) > - goto error; > - > - memcpy(dev->_filename_ch2, dev->input_filename_ch2, > - str_length + 1); > - } else { > - str_length = strlen(dev->_defaultname_ch2); > - dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename_ch2) > - goto error; > - > - memcpy(dev->_filename_ch2, dev->_defaultname_ch2, > - str_length + 1); > - } > - > - /* Default if filename is empty string */ > - if (strcmp(dev->input_filename_ch2, "") = 0) { > - if (dev->_isNTSC_ch2) { > - dev->_filename_ch2 > - (dev->_pixel_format_ch2 = > - PIXEL_FRMT_411) ? "/root/vid411.yuv" : > - "/root/vidtest.yuv"; > - } else { > - dev->_filename_ch2 > - (dev->_pixel_format_ch2 = > - PIXEL_FRMT_411) ? "/root/pal411.yuv" : > - "/root/pal422.yuv"; > - } > + if (dev->input_filename_ch2 && *dev->input_filename_ch2) > + fname = dev->input_filename_ch2; > + else if (dev->input_filename_ch2) { > + /* Default if filename is empty string */ > + if (dev->_isNTSC_ch2) > + fname = (dev->_pixel_format_ch2 = PIXEL_FRMT_411) ? > + "/root/vid411.yuv" : "/root/vidtest.yuv"; > + else > + fname = (dev->_pixel_format_ch2 = PIXEL_FRMT_411) ? > + "/root/pal411.yuv" : "/root/pal422.yuv"; > + } else > + fname = dev->_defaultname_ch2; > + > + dev->_filename_ch2 = kstrdup(fname, GFP_KERNEL); > + if (!dev->_filename_ch2) { > + retval = -ENOMEM; > + goto error; > } > > retval > @@ -851,5 +834,5 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select, > error: > cx25821_dev_unregister(dev); > > - return err; > + return retval; > } > diff --git a/drivers/staging/cx25821/cx25821-video-upstream.c b/drivers/staging/cx25821/cx25821-video-upstream.c > index 756a820..d51c6c1 100644 > --- a/drivers/staging/cx25821/cx25821-video-upstream.c > +++ b/drivers/staging/cx25821/cx25821-video-upstream.c > @@ -800,10 +800,9 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select, > struct sram_channel *sram_ch; > u32 tmp; > int retval = 0; > - int err = 0; > int data_frame_size = 0; > int risc_buffer_size = 0; > - int str_length = 0; > + char *fname; > > if (dev->_is_running) { > printk(KERN_INFO "Video Channel is still running so return!\n"); > @@ -840,37 +839,23 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select, > risc_buffer_size > dev->_isNTSC ? NTSC_RISC_BUF_SIZE : PAL_RISC_BUF_SIZE; > > - if (dev->input_filename) { > - str_length = strlen(dev->input_filename); > - dev->_filename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename) > - goto error; > - > - memcpy(dev->_filename, dev->input_filename, str_length + 1); > - } else { > - str_length = strlen(dev->_defaultname); > - dev->_filename = kmalloc(str_length + 1, GFP_KERNEL); > - > - if (!dev->_filename) > - goto error; > - > - memcpy(dev->_filename, dev->_defaultname, str_length + 1); > - } > - > - /* Default if filename is empty string */ > - if (strcmp(dev->input_filename, "") = 0) { > - if (dev->_isNTSC) { > - dev->_filename > - (dev->_pixel_format = > - PIXEL_FRMT_411) ? "/root/vid411.yuv" : > - "/root/vidtest.yuv"; > - } else { > - dev->_filename > - (dev->_pixel_format = > - PIXEL_FRMT_411) ? "/root/pal411.yuv" : > - "/root/pal422.yuv"; > - } > + if (dev->input_filename && *dev->input_filename) > + fname = dev->input_filename; > + else if (dev->input_filename) { > + /* Default if filename is empty string */ > + if (dev->_isNTSC) > + fname = (dev->_pixel_format = PIXEL_FRMT_411) ? > + "/root/vid411.yuv" : "/root/vidtest.yuv"; > + else > + fname = (dev->_pixel_format = PIXEL_FRMT_411) ? > + "/root/pal411.yuv" : "/root/pal422.yuv"; > + } else > + fname = dev->_defaultname; > + > + dev->_filename = kstrdup(fname, GFP_KERNEL); > + if (!dev->_filename) { > + retval = -ENOMEM; > + goto error; > } > > dev->_is_running = 0; > @@ -908,5 +893,5 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select, > error: > cx25821_dev_unregister(dev); > > - return err; > + return retval; > } > > >
next prev parent reply other threads:[~2010-10-18 17:44 UTC|newest] Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-10-17 18:48 [PATCH 0/3] Use kasprintf Julia Lawall 2010-10-17 18:48 ` Julia Lawall 2010-10-17 18:48 ` [PATCH 1/3] drivers/staging/cx25821: " Julia Lawall 2010-10-17 18:48 ` Julia Lawall 2010-10-18 7:15 ` walter harms 2010-10-18 7:15 ` walter harms 2010-10-18 8:22 ` Julia Lawall 2010-10-18 8:22 ` Julia Lawall 2010-10-18 9:27 ` walter harms 2010-10-18 9:27 ` walter harms 2010-10-18 12:25 ` [PATCH 1/3] drivers/staging/cx25821: Use kstrdup Julia Lawall 2010-10-18 12:25 ` Julia Lawall 2010-10-18 17:38 ` Joe Perches 2010-10-18 17:38 ` Joe Perches 2010-10-18 17:44 ` Julia Lawall [this message] 2010-10-18 17:44 ` Julia Lawall 2010-10-18 17:55 ` Joe Perches 2010-10-18 17:55 ` Joe Perches 2010-10-18 17:58 ` Julia Lawall 2010-10-18 17:58 ` Julia Lawall 2010-10-18 20:43 ` Julia Lawall 2010-10-18 20:43 ` Julia Lawall 2010-10-17 18:48 ` [PATCH 2/3] fs/ceph/xattr.c: Use kasprintf Julia Lawall 2010-10-17 18:48 ` Julia Lawall 2010-10-17 18:54 ` Joe Perches 2010-10-17 18:54 ` Joe Perches 2010-10-17 19:02 ` Julia Lawall 2010-10-17 19:02 ` Julia Lawall 2010-10-17 19:55 ` [PATCH 2/3] fs/ceph/xattr.c: Use kmemdup Julia Lawall 2010-10-17 19:55 ` Julia Lawall 2010-10-17 21:36 ` Sage Weil 2010-10-17 21:36 ` Sage Weil 2010-10-17 18:48 ` [PATCH 3/3] fs/jffs2/dir.c: Use kasprintf Julia Lawall 2010-10-17 18:48 ` Julia Lawall 2010-10-17 18:48 ` Julia Lawall [not found] ` <1287341849.20968.62.camel@Joe-Laptop> 2010-10-17 19:56 ` [PATCH 3/3] fs/jffs2/dir.c: Use kmemdup Julia Lawall 2010-10-17 19:56 ` Julia Lawall 2010-10-18 3:43 ` Artem Bityutskiy 2010-10-18 3:43 ` Artem Bityutskiy 2010-10-18 18:09 ` [PATCH 0/3] Use kasprintf Paulo Marques 2010-10-18 18:09 ` Paulo Marques 2010-10-18 20:02 ` Julia Lawall 2010-10-18 20:02 ` Julia Lawall
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