firmware: send -EINTR on signal abort on fallback mechanism

Right now we send -EAGAIN to a syfs write which got interrupted.
Userspace can't tell what happened though, send -EINTR if we
were killed due to a signal so userspace can tell things apart.

This is only applicable to the fallback mechanism.

Reported-by: Martin Fuzzey <mfuzzey@parkeon.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index b9f907eedbf7..ac7e32fac8fc 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -1089,9 +1089,12 @@ static int _request_firmware_load(struct firmware_priv *fw_priv,
                 mutex_unlock(&fw_lock);
         }
 
-        if (fw_state_is_aborted(&buf->fw_st))
-                retval = -EAGAIN;
-        else if (buf->is_paged_buf && !buf->data)
+        if (fw_state_is_aborted(&buf->fw_st)) {
+                if (retval == -ERESTARTSYS)
+                        retval = -EINTR;
+                else
+                        retval = -EAGAIN;
+        } else if (buf->is_paged_buf && !buf->data)
                 retval = -ENOMEM;
 
         device_del(f_dev);