From: Julius Werner <jwerner@chromium.org> To: swboyd@chromium.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, LKML <linux-kernel@vger.kernel.org>, Wei-Ning Huang <wnhuang@chromium.org>, Julius Werner <jwerner@chromium.org>, Brian Norris <briannorris@chromium.org>, samuel@sholland.org Subject: Re: [PATCH v3 6/7] firmware: coreboot: Only populate devices in coreboot_table_init() Date: Thu, 9 Aug 2018 14:02:53 -0700 [thread overview] Message-ID: <CAODwPW-Qc3JanqsB0C42O796fbDiwvUKYOhUXNYOaS_mzgCS8g@mail.gmail.com> (raw) In-Reply-To: <20180809171722.144325-7-swboyd@chromium.org> On Thu, Aug 9, 2018 at 10:17 AM Stephen Boyd <swboyd@chromium.org> wrote: > > This function checks the header for sanity, registers a bus, and > populates devices for each coreboot table entry. Let's just populate > devices here and pull the other bits up into the caller so that this > function can be repurposed for pure device creation and registration. We > can devm()ify the memory mapping at the same time to keep error paths > simpler. > > Cc: Wei-Ning Huang <wnhuang@chromium.org> > Cc: Julius Werner <jwerner@chromium.org> > Cc: Brian Norris <briannorris@chromium.org> > Cc: Samuel Holland <samuel@sholland.org> > Suggested-by: Julius Werner <jwerner@chromium.org> > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > --- > drivers/firmware/google/coreboot_table.c | 66 +++++++++++------------- > 1 file changed, 29 insertions(+), 37 deletions(-) > > diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c > index f343dbe86448..814913606d22 100644 > --- a/drivers/firmware/google/coreboot_table.c > +++ b/drivers/firmware/google/coreboot_table.c > @@ -32,8 +32,6 @@ > #define CB_DEV(d) container_of(d, struct coreboot_device, dev) > #define CB_DRV(d) container_of(d, struct coreboot_driver, drv) > > -static struct coreboot_table_header *ptr_header; > - > static int coreboot_bus_match(struct device *dev, struct device_driver *drv) > { > struct coreboot_device *device = CB_DEV(dev); > @@ -94,35 +92,21 @@ void coreboot_driver_unregister(struct coreboot_driver *driver) > } > EXPORT_SYMBOL(coreboot_driver_unregister); > > -static int coreboot_table_init(struct device *dev, void *ptr) > +static int coreboot_table_populate(struct device *dev, void *ptr) > { > int i, ret; > void *ptr_entry; > struct coreboot_device *device; > struct coreboot_table_entry *entry; > - struct coreboot_table_header *header; > - > - ptr_header = ptr; > - header = ptr; > - > - if (strncmp(header->signature, "LBIO", sizeof(header->signature))) { > - pr_warn("coreboot_table: coreboot table missing or corrupt!\n"); > - return -ENODEV; > - } > - > - ret = bus_register(&coreboot_bus_type); > - if (ret) > - return ret; > + struct coreboot_table_header *header = ptr; > > - ptr_entry = ptr_header + header->header_bytes; > + ptr_entry = ptr + header->header_bytes; > for (i = 0; i < header->table_entries; i++) { > entry = ptr_entry; > > device = kzalloc(sizeof(struct device) + entry->size, GFP_KERNEL); > - if (!device) { > - ret = -ENOMEM; > - break; > - } > + if (!device) > + return -ENOMEM; > > dev_set_name(&device->dev, "coreboot%d", i); > device->dev.parent = dev; > @@ -133,18 +117,13 @@ static int coreboot_table_init(struct device *dev, void *ptr) > ret = device_register(&device->dev); > if (ret) { > put_device(&device->dev); > - break; > + return ret; > } > > ptr_entry += entry->size; > } > > - if (ret) { > - bus_unregister(&coreboot_bus_type); > - memunmap(ptr); > - } > - > - return ret; > + return 0; > } > > static int coreboot_table_probe(struct platform_device *pdev) > @@ -152,7 +131,9 @@ static int coreboot_table_probe(struct platform_device *pdev) > resource_size_t len; > struct coreboot_table_header *header; > struct resource *res; > + struct device *dev = &pdev->dev; > void *ptr; > + int ret; > > res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > if (!res) > @@ -162,26 +143,37 @@ static int coreboot_table_probe(struct platform_device *pdev) > if (!res->start || !len) > return -EINVAL; > > + /* Map and check just the header first to make sure things are sane */ > header = memremap(res->start, sizeof(*header), MEMREMAP_WB); > - if (header == NULL) > + if (!header) > return -ENOMEM; > > - ptr = memremap(res->start, header->header_bytes + header->table_bytes, > - MEMREMAP_WB); > + if (strncmp(header->signature, "LBIO", sizeof(header->signature))) { > + dev_warn(dev, "coreboot table missing or corrupt!\n"); > + return -ENODEV; Leaking the mapping here. > + } > + > + ptr = devm_memremap(dev, res->start, > + header->header_bytes + header->table_bytes, > + MEMREMAP_WB); > memunmap(header); > if (!ptr) > return -ENOMEM; > > - return coreboot_table_init(&pdev->dev, ptr); > + ret = bus_register(&coreboot_bus_type); > + if (ret) > + return ret; > + > + ret = coreboot_table_populate(dev, ptr); > + if (ret) > + bus_unregister(&coreboot_bus_type); > + > + return ret; > } > > static int coreboot_table_remove(struct platform_device *pdev) > { > - if (ptr_header) { > - bus_unregister(&coreboot_bus_type); > - memunmap(ptr_header); > - ptr_header = NULL; > - } > + bus_unregister(&coreboot_bus_type); > > return 0; > } > -- > Sent by a computer through tubes >
next prev parent reply other threads:[~2018-08-09 21:03 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-08-09 17:17 [PATCH v3 0/7] firmware: coreboot: Fix probe and simplify code Stephen Boyd 2018-08-09 17:17 ` [PATCH v3 1/7] firmware: coreboot: Let OF core populate platform device Stephen Boyd 2018-08-09 17:31 ` Brian Norris 2018-08-09 17:17 ` [PATCH v3 2/7] firmware: coreboot: Unmap ioregion on failure Stephen Boyd 2018-08-09 17:49 ` Brian Norris 2018-08-09 19:40 ` Stephen Boyd 2018-08-09 19:52 ` Brian Norris 2018-08-09 23:25 ` Stephen Boyd 2018-08-09 17:17 ` [PATCH v3 3/7] firmware: coreboot: Make bus registration symmetric Stephen Boyd 2018-08-09 18:10 ` Julius Werner 2018-08-09 23:30 ` Stephen Boyd 2018-08-09 17:17 ` [PATCH v3 4/7] firmware: coreboot: Collapse platform drivers into bus core Stephen Boyd 2018-08-09 17:17 ` [PATCH v3 5/7] firmware: coreboot: Remap RAM with memremap() instead of ioremap() Stephen Boyd 2018-08-09 18:24 ` Julius Werner 2018-08-09 22:07 ` Stephen Boyd 2018-08-09 17:17 ` [PATCH v3 6/7] firmware: coreboot: Only populate devices in coreboot_table_init() Stephen Boyd 2018-08-09 21:02 ` Julius Werner [this message] 2018-08-09 23:43 ` Stephen Boyd 2018-08-09 17:17 ` [PATCH v3 7/7] firmware: coreboot: Request table region for exclusive access Stephen Boyd 2018-08-09 21:07 ` Julius Werner 2018-08-09 23:03 ` Stephen Boyd 2018-08-09 23:37 ` Julius Werner 2018-08-09 23:44 ` Julius Werner 2018-08-10 2:54 ` Stephen Boyd 2018-08-10 23:24 ` Stephen Boyd 2018-08-09 18:03 ` [PATCH v3 0/7] firmware: coreboot: Fix probe and simplify code Brian Norris
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