linux-kernel - RE: [PATCH] USB: gadget: f_mass_storage: fix in fsg_common

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Date:	Wed, 12 May 2010 16:03:43 +0530
From:	Viral Mehta <Viral.Mehta@...infotech.com>
To:	Michał Nazarewicz <m.nazarewicz@...sung.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
CC:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] USB: gadget: f_mass_storage: fix in fsg_common_init()
 error recovery


>Because of that, I the "goto error_release" to be cleaner in the sense that
>there is a single error recovery path and only one place where
>free_storage_on_release flag is checked and common freed.

In that case, in addition to your previous patch, below hunk is needed


diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index f4911c0..b1648fc 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -2883,15 +2883,16 @@ static void fsg_common_release(struct kref *ref)

        /* Beware tempting for -> do-while optimization: when in error
         * recovery nluns may be zero. */
+       if(common->luns) {
+               for (; i; --i, ++lun) {
+                       device_remove_file(&lun->dev, &dev_attr_ro);
+                       device_remove_file(&lun->dev, &dev_attr_file);
+                       fsg_lun_close(lun);
+                       device_unregister(&lun->dev);
+               }

-       for (; i; --i, ++lun) {
-               device_remove_file(&lun->dev, &dev_attr_ro);
-               device_remove_file(&lun->dev, &dev_attr_file);
-               fsg_lun_close(lun);
-               device_unregister(&lun->dev);
+               kfree(common->luns);
        }
-
-       kfree(common->luns);
        if (common->free_storage_on_release)
                kfree(common);
 }


Thanks,
Viral

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