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rapidio: fix error handling in mbox request/release functions 

Add checking for error code returned by HW-specific mbox open routines.
Ensure that resources are properly release if failed.

This patch is applicable to kernel versions starting from v2.6.15.

Link: http://lkml.kernel.org/r/1469125134-16523-9-git-send-email-alexandre.bounine@idt.com
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine 2016-08-02 14:06:49 -07:00 committed by Linus Torvalds
parent f5485eb0b6
commit 06e1b2497c
1 changed files with 42 additions and 12 deletions
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54
drivers/rapidio/rio.c
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@ -268,6 +268,12 @@ int rio_request_inb_mbox(struct rio_mport *mport,
mport->inb_msg[mbox].mcback = minb;
rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
if (rc) {
mport->inb_msg[mbox].mcback = NULL;
mport->inb_msg[mbox].res = NULL;
release_resource(res);
kfree(res);
}
} else
rc = -ENOMEM;
@ -285,13 +291,22 @@ int rio_request_inb_mbox(struct rio_mport *mport,
*/
int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
{
if (mport->ops->close_inb_mbox) {
mport->ops->close_inb_mbox(mport, mbox);
int rc;
/* Release the mailbox resource */
return release_resource(mport->inb_msg[mbox].res);
} else
return -ENOSYS;
if (!mport->ops->close_inb_mbox || !mport->inb_msg[mbox].res)
return -EINVAL;
mport->ops->close_inb_mbox(mport, mbox);
mport->inb_msg[mbox].mcback = NULL;
rc = release_resource(mport->inb_msg[mbox].res);
if (rc)
return rc;
kfree(mport->inb_msg[mbox].res);
mport->inb_msg[mbox].res = NULL;
return 0;
}
/**
@ -336,6 +351,12 @@ int rio_request_outb_mbox(struct rio_mport *mport,
mport->outb_msg[mbox].mcback = moutb;
rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
if (rc) {
mport->outb_msg[mbox].mcback = NULL;
mport->outb_msg[mbox].res = NULL;
release_resource(res);
kfree(res);
}
} else
rc = -ENOMEM;
@ -353,13 +374,22 @@ int rio_request_outb_mbox(struct rio_mport *mport,
*/
int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
{
if (mport->ops->close_outb_mbox) {
mport->ops->close_outb_mbox(mport, mbox);
int rc;
/* Release the mailbox resource */
return release_resource(mport->outb_msg[mbox].res);
} else
return -ENOSYS;
if (!mport->ops->close_outb_mbox || !mport->outb_msg[mbox].res)
return -EINVAL;
mport->ops->close_outb_mbox(mport, mbox);
mport->outb_msg[mbox].mcback = NULL;
rc = release_resource(mport->outb_msg[mbox].res);
if (rc)
return rc;
kfree(mport->outb_msg[mbox].res);
mport->outb_msg[mbox].res = NULL;
return 0;
}
/**