linux-kernel - [PATCH v4 2/5] firmware: send -EINTR on signal abort on fallback mechanism

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Date:   Thu, 20 Jul 2017 13:13:39 -0700
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     wagi@...om.org, yi1.li@...ux.intel.com, takahiro.akashi@...aro.org,
        bjorn.andersson@...aro.org, luto@...nel.org, ebiederm@...ssion.com,
        dmitry.torokhov@...il.com, arend.vanspriel@...adcom.com,
        dwmw2@...radead.org, rjw@...ysocki.net, atull@...nel.org,
        moritz.fischer@...us.com, pmladek@...e.com,
        johannes.berg@...el.com, emmanuel.grumbach@...el.com,
        luciano.coelho@...el.com, kvalo@...eaurora.org,
        torvalds@...ux-foundation.org, keescook@...omium.org,
        dhowells@...hat.com, pjones@...hat.com, hdegoede@...hat.com,
        alan@...ux.intel.com, tytso@....edu, dave@...olabs.net,
        mawilcox@...rosoft.com, tglx@...utronix.de, peterz@...radead.org,
        mfuzzey@...keon.com, jakub.kicinski@...ronome.com,
        nbroeking@...com, jewalt@...innovations.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH v4 2/5] 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@...keon.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 drivers/base/firmware_class.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index bfbe1e154128..0125e605eb34 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -1085,9 +1085,12 @@ 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);
-- 
2.11.0