Re: [PATCH] x86/efi-bgrt: Switch all pr_err() to pr_debug() for invalid BGRT

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



(additionally CC-ing Josh Triplett)

On 04/27/2016 02:50 PM, Josh Boyer wrote:
The promise of pretty boot splashes from firmware via BGRT was at
best only that; a promise.  The kernel diligently checks to make
sure the BGRT data firmware gives it is valid, and dutifully warns
the user when it isn't.  However, it does so via the pr_err log
level which seems unnecessary.  The user cannot do anything about
this and there really isn't an error on the part of Linux to
correct.

This lowers the log level by using pr_debug instead.  Users will
no longer have their boot process uglified by the kernel reminding
us that firmware can and often is broken.  Ironic, considering
BGRT is supposed to make boot pretty to begin with.
Hi Josh Boyer,

Are you seeing these errors somewhere? I recently fixed the error "Ignoring BGRT: invalid status 0 (expected 1)" because Linux apparently interpreted that part of the specification differently than others. If that's the error you are seeing, perhaps your problem is already solved in recent kernels? (fixed in commit 66dbe99)

Personally I agree that BGRT messages should not annoy actual users of production firmwares. However I also agree with the previous consensus that these checks (for actual spec violations) should remain pr_err unless some production firmware is triggering them. What do you think?

Greetings,
Môshe van der Sterre

Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
---
  arch/x86/platform/efi/efi-bgrt.c | 18 +++++++++---------
  1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/platform/efi/efi-bgrt.c b/arch/x86/platform/efi/efi-bgrt.c
index a2433817c987..6f70d2ac8029 100644
--- a/arch/x86/platform/efi/efi-bgrt.c
+++ b/arch/x86/platform/efi/efi-bgrt.c
@@ -43,40 +43,40 @@ void __init efi_bgrt_init(void)
  		return;
if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
-		pr_err("Ignoring BGRT: invalid length %u (expected %zu)\n",
+		pr_debug("Ignoring BGRT: invalid length %u (expected %zu)\n",
  		       bgrt_tab->header.length, sizeof(*bgrt_tab));
  		return;
  	}
  	if (bgrt_tab->version != 1) {
-		pr_err("Ignoring BGRT: invalid version %u (expected 1)\n",
+		pr_debug("Ignoring BGRT: invalid version %u (expected 1)\n",
  		       bgrt_tab->version);
  		return;
  	}
  	if (bgrt_tab->status & 0xfe) {
-		pr_err("Ignoring BGRT: reserved status bits are non-zero %u\n",
+		pr_debug("Ignoring BGRT: reserved status bits are non-zero %u\n",
  		       bgrt_tab->status);
  		return;
  	}
  	if (bgrt_tab->image_type != 0) {
-		pr_err("Ignoring BGRT: invalid image type %u (expected 0)\n",
+		pr_debug("Ignoring BGRT: invalid image type %u (expected 0)\n",
  		       bgrt_tab->image_type);
  		return;
  	}
  	if (!bgrt_tab->image_address) {
-		pr_err("Ignoring BGRT: null image address\n");
+		pr_debug("Ignoring BGRT: null image address\n");
  		return;
  	}
image = memremap(bgrt_tab->image_address, sizeof(bmp_header), MEMREMAP_WB);
  	if (!image) {
-		pr_err("Ignoring BGRT: failed to map image header memory\n");
+		pr_debug("Ignoring BGRT: failed to map image header memory\n");
  		return;
  	}
memcpy(&bmp_header, image, sizeof(bmp_header));
  	memunmap(image);
  	if (bmp_header.id != 0x4d42) {
-		pr_err("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
+		pr_debug("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
  			bmp_header.id);
  		return;
  	}
@@ -84,14 +84,14 @@ void __init efi_bgrt_init(void)
bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
  	if (!bgrt_image) {
-		pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
+		pr_debug("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
  		       bgrt_image_size);
  		return;
  	}
image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
  	if (!image) {
-		pr_err("Ignoring BGRT: failed to map image memory\n");
+		pr_debug("Ignoring BGRT: failed to map image memory\n");
  		kfree(bgrt_image);
  		bgrt_image = NULL;
  		return;

--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux