linux-kernel - [PATCH] firmware_loader: Fix labels with comma for builtin firmware

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Message-Id: <20191115225911.3260-1-linus.walleij@linaro.org>
Date:   Fri, 15 Nov 2019 23:59:11 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH] firmware_loader: Fix labels with comma for builtin firmware

Some firmware images contain a comma, such as:
EXTRA_FIRMWARE "brcm/brcmfmac4334-sdio.samsung,gt-s7710.txt"
as Broadcom firmware simply tags the device tree compatible
string at the end of the firmware parameter file. And the
compatible string contains a comma.

This doesn't play well with gas:

drivers/base/firmware_loader/builtin/brcm/brcmfmac4334-sdio.samsung,gt-s7710.txt.gen.S: Assembler messages:
drivers/base/firmware_loader/builtin/brcm/brcmfmac4334-sdio.samsung,gt-s7710.txt.gen.S:4: Error: bad instruction `_fw_brcm_brcmfmac4334_sdio_samsung,gt_s7710_txt_bin:'
drivers/base/firmware_loader/builtin/brcm/brcmfmac4334-sdio.samsung,gt-s7710.txt.gen.S:9: Error: bad instruction `_fw_brcm_brcmfmac4334_sdio_samsung,gt_s7710_txt_name:'
drivers/base/firmware_loader/builtin/brcm/brcmfmac4334-sdio.samsung,gt-s7710.txt.gen.S:15: Error: can't resolve `.rodata' {.rodata section} - `_fw_brcm_brcmfmac4334_sdio_samsung' {*UND* section}
make[6]: *** [../scripts/Makefile.build:357: drivers/base/firmware_loader/builtin/brcm/brcmfmac4334-sdio.samsung,gt-s7710.txt.gen.o] Error 1

We need to get rid of the comma from the labels used by the
assembly stub generator.

Replacing a comma using GNU Make subst requires a helper
variable.

Cc: Stephan Gerhold <stephan@...hold.net>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/base/firmware_loader/builtin/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/firmware_loader/builtin/Makefile b/drivers/base/firmware_loader/builtin/Makefile
index 37e5ae387400..4a66888e7253 100644
--- a/drivers/base/firmware_loader/builtin/Makefile
+++ b/drivers/base/firmware_loader/builtin/Makefile
@@ -8,7 +8,8 @@ fwdir := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
 obj-y  := $(addsuffix .gen.o, $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE)))
 
 FWNAME    = $(patsubst $(obj)/%.gen.S,%,$@)
-FWSTR     = $(subst /,_,$(subst .,_,$(subst -,_,$(FWNAME))))
+comma     := ,
+FWSTR     = $(subst $(comma),_,$(subst /,_,$(subst .,_,$(subst -,_,$(FWNAME)))))
 ASM_WORD  = $(if $(CONFIG_64BIT),.quad,.long)
 ASM_ALIGN = $(if $(CONFIG_64BIT),3,2)
 PROGBITS  = $(if $(CONFIG_ARM),%,@)progbits
-- 
2.21.0