From: zhong jiang <zhongjiang@huawei.com> To: <jikos@kernel.org>, <benjamin.tissoires@redhat.com> Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org> Subject: [PATCH v2] HID: logitech: fix a used uninitialized GCC warning Date: Thu, 13 Sep 2018 15:41:10 +0800 [thread overview] Message-ID: <1536824470-36659-1-git-send-email-zhongjiang@huawei.com> (raw) Fix the following compile warning: drivers/hid/hid-logitech-hidpp.c: In function 'hi_res_scroll_enable': drivers/hid/hid-logitech-hidpp.c:2714:54: warning: 'multiplier' may be used uninitialized in this function [-Wmaybe-uninitialized] hidpp->vertical_wheel_counter.resolution_multiplier = multiplier; Signed-off-by: zhong jiang <zhongjiang@huawei.com> --- v1->v2: According to Benjamin's suggestion, To initialize the value and remove the duplicated assignement. drivers/hid/hid-logitech-hidpp.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index 5f0c080..f012808 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -1231,7 +1231,6 @@ static int hidpp_hrw_get_wheel_capability(struct hidpp_device *hidpp, *multiplier = response.fap.params[0]; return 0; return_default: - *multiplier = 8; hid_warn(hidpp->hid_dev, "Couldn't get wheel multiplier (error %d), assuming %d.\n", ret, *multiplier); @@ -2696,7 +2695,7 @@ static int hi_res_scroll_look_up_microns(__u32 product_id) static int hi_res_scroll_enable(struct hidpp_device *hidpp) { int ret; - u8 multiplier; + u8 multiplier = 8; if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_X2121) { ret = hidpp_hrw_set_wheel_mode(hidpp, false, true, false); @@ -2704,10 +2703,9 @@ static int hi_res_scroll_enable(struct hidpp_device *hidpp) } else if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_X2120) { ret = hidpp_hrs_set_highres_scrolling_mode(hidpp, true, &multiplier); - } else /* if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_1P0) */ { + } else /* if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_1P0) */ ret = hidpp10_enable_scrolling_acceleration(hidpp); - multiplier = 8; - } + if (ret) return ret; -- 1.7.12.4
WARNING: multiple messages have this Message-ID (diff)
From: zhong jiang <zhongjiang@huawei.com> To: jikos@kernel.org, benjamin.tissoires@redhat.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] HID: logitech: fix a used uninitialized GCC warning Date: Thu, 13 Sep 2018 15:41:10 +0800 [thread overview] Message-ID: <1536824470-36659-1-git-send-email-zhongjiang@huawei.com> (raw) Fix the following compile warning: drivers/hid/hid-logitech-hidpp.c: In function 'hi_res_scroll_enable': drivers/hid/hid-logitech-hidpp.c:2714:54: warning: 'multiplier' may be used uninitialized in this function [-Wmaybe-uninitialized] hidpp->vertical_wheel_counter.resolution_multiplier = multiplier; Signed-off-by: zhong jiang <zhongjiang@huawei.com> --- v1->v2: According to Benjamin's suggestion, To initialize the value and remove the duplicated assignement. drivers/hid/hid-logitech-hidpp.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index 5f0c080..f012808 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -1231,7 +1231,6 @@ static int hidpp_hrw_get_wheel_capability(struct hidpp_device *hidpp, *multiplier = response.fap.params[0]; return 0; return_default: - *multiplier = 8; hid_warn(hidpp->hid_dev, "Couldn't get wheel multiplier (error %d), assuming %d.\n", ret, *multiplier); @@ -2696,7 +2695,7 @@ static int hi_res_scroll_look_up_microns(__u32 product_id) static int hi_res_scroll_enable(struct hidpp_device *hidpp) { int ret; - u8 multiplier; + u8 multiplier = 8; if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_X2121) { ret = hidpp_hrw_set_wheel_mode(hidpp, false, true, false); @@ -2704,10 +2703,9 @@ static int hi_res_scroll_enable(struct hidpp_device *hidpp) } else if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_X2120) { ret = hidpp_hrs_set_highres_scrolling_mode(hidpp, true, &multiplier); - } else /* if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_1P0) */ { + } else /* if (hidpp->quirks & HIDPP_QUIRK_HI_RES_SCROLL_1P0) */ ret = hidpp10_enable_scrolling_acceleration(hidpp); - multiplier = 8; - } + if (ret) return ret; -- 1.7.12.4
next reply other threads:[~2018-09-13 7:53 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-09-13 7:41 zhong jiang [this message] 2018-09-13 7:41 ` [PATCH v2] HID: logitech: fix a used uninitialized GCC warning zhong jiang 2018-09-21 1:46 ` zhong jiang 2018-09-21 1:46 ` zhong jiang 2018-09-24 9:31 ` Jiri Kosina
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