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drivers/ata/sata_dwc_460ex.c: add missing kfree 

Currently, error handling code in this function calls the function
sata_dwc_port_stop, but this function has essentially no effect if hsdevp
has not been stored in ap, which is the case throughout this function.  The
only effect is to print a debugging message including ap->print_id.

The code is rewritten to not call sata_dwc_port_stop, but instead to jump
to a local label that prints the original error message and the print_id
information.  In the case where hsdevp has been already allocated (but not
yet stored in ap), this value is freed as well.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@exists@
local idexpression x;
statement S,S1;
expression E;
identifier fl;
expression *ptr != NULL;
@@

x = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...kfree(x)...+> }
     when any
     when != true x == NULL
x->fl
...>
(
if (x == NULL) S1
|
if (...) { ... when != x
               when forall
(
 return \(0\|<+...x...+>\|ptr\);
|
* return ...;
)
}
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Julia Lawall 2011-08-08 13:17:57 +02:00 committed by Jeff Garzik
parent e39c75cf3e
commit a081da630d
1 changed files with 6 additions and 8 deletions
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14
drivers/ata/sata_dwc_460ex.c
View File

@ -1329,7 +1329,7 @@ static int sata_dwc_port_start(struct ata_port *ap)
dev_err(ap->dev, "%s: dma_alloc_coherent failed\n",
__func__);
err = -ENOMEM;
goto CLEANUP;
goto CLEANUP_ALLOC;
}
}
@ -1349,15 +1349,13 @@ static int sata_dwc_port_start(struct ata_port *ap)
/* Clear any error bits before libata starts issuing commands */
clear_serror();
ap->private_data = hsdevp;
dev_dbg(ap->dev, "%s: done\n", __func__);
return 0;
CLEANUP_ALLOC:
kfree(hsdevp);
CLEANUP:
if (err) {
sata_dwc_port_stop(ap);
dev_dbg(ap->dev, "%s: fail\n", __func__);
} else {
dev_dbg(ap->dev, "%s: done\n", __func__);
}
dev_dbg(ap->dev, "%s: fail. ap->id = %d\n", __func__, ap->print_id);
return err;
}