linux-kernel - [PATCH v4 4/5] firmware: enable a debug print for batched requests

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Date:   Thu, 20 Jul 2017 13:13:41 -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 4/5] firmware: enable a debug print for batched requests

Otherwise there is no easy way this actually happened.

Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 drivers/base/firmware_class.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index ba272a65291d..a5fb884a136d 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -333,6 +333,7 @@ static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
 	return NULL;
 }
 
+/* Returns 1 for batching firmware requests with the same name */
 static int fw_lookup_and_allocate_buf(const char *fw_name,
 				      struct firmware_cache *fwc,
 				      struct firmware_buf **buf, void *dbuf,
@@ -346,6 +347,7 @@ static int fw_lookup_and_allocate_buf(const char *fw_name,
 		kref_get(&tmp->ref);
 		spin_unlock(&fwc->lock);
 		*buf = tmp;
+		pr_debug("batched request - sharing the same struct firmware_buf and lookup for multiple requests\n");
 		return 1;
 	}
 	tmp = __allocate_fw_buf(fw_name, fwc, dbuf, size);
-- 
2.11.0