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nvmem: core: Check read_only flag for force_ro in bin_attr_nvmem_write()

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commit da9596955c05966768364ab1cad2f43fcddc6f06 upstream.

The bin_attr_nvmem_write() must check the read_only flag and block
writes on read-only devices, now that a nvmem device can be switched
between read-write and read-only mode at runtime using the force_ro
attribute. Add the missing check.

Fixes: 9d7eb234ac ("nvmem: core: Implement force_ro sysfs attribute")
Cc: Stable@vger.kernel.org
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20241030140253.40445-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Vasut
2024-10-30 14:02:53 +00:00
committed by Greg Kroah-Hartman
parent f25a9f1df1
commit d60e418834
1 changed files with 1 additions and 1 deletions
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drivers/nvmem/core.c
+1 -1
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@@ -267,7 +267,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,
count = round_down(count, nvmem->word_size);
if (!nvmem->reg_write)
if (!nvmem->reg_write || nvmem->read_only)
return -EPERM;
rc = nvmem_reg_write(nvmem, pos, buf, count);