Re: [PATCH] firmware: add firmware to new device's devres list for second time cache
From: Kai-Heng Feng
Date: Sat Sep 16 2017 - 00:46:44 EST
On Tue, Aug 22, 2017 at 12:52 AM, Kai-Heng Feng
> Currently, firmware will only be chached if assign_firmware_buf() gets
> When a device loses its power or a USB device gets plugged to another
> port under suspend, request_firmware() can still find cached firmware,
> but firmware name no longer associates with the new device's devres.
> So next time the system suspend, those firmware won't be cached.
> Hence, we should add the firmware name to the devres when the firmware
> is found in cache, to make the firmware cacheable next time.
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> drivers/base/firmware_class.c | 4 ++++
> 1 file changed, 4 insertions(+)
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index bfbe1e154128..a99de34e3fdc 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -1177,6 +1177,10 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
> ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf, dbuf, size);
> + /* device might be a new one, add it to devres list */
> + if (ret == 0 || ret == 1)
> + fw_add_devm_name(device, name);
> * bind with 'buf' now to avoid warning in failure path
> * of requesting firmware.
*A gentle ping here*