[PATCH] char: mxser_new, check request_region retvals

mxser_new, check request_region retvals

Return values of (pci_)request_region should be checked and error should be
returned if something is in bad state.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 17 insertions, 4 deletions

diff --git a/drivers/char/mxser_new.c b/drivers/char/mxser_new.c
index 4db43f31b693..5a4c80d38c65 100644
--- a/drivers/char/mxser_new.c
+++ b/drivers/char/mxser_new.c
@@ -622,19 +622,24 @@ static int __init mxser_get_PCI_conf(int board_type, struct mxser_board *brd,
 {
         unsigned int i, j;
         unsigned long ioaddress;
+        int retval;
 
         /* io address */
         brd->board_type = board_type;
         brd->nports = mxser_numports[board_type - 1];
         ioaddress = pci_resource_start(pdev, 2);
-        pci_request_region(pdev, 2, "mxser(IO)");
+        retval = pci_request_region(pdev, 2, "mxser(IO)");
+        if (retval)
+                goto err;
 
         for (i = 0; i < brd->nports; i++)
                 brd->ports[i].ioaddr = ioaddress + 8 * i;
 
         /* vector */
         ioaddress = pci_resource_start(pdev, 3);
-        pci_request_region(pdev, 3, "mxser(vector)");
+        retval = pci_request_region(pdev, 3, "mxser(vector)");
+        if (retval)
+                goto err_relio;
         brd->vector = ioaddress;
 
         /* irq */
@@ -674,6 +679,10 @@ static int __init mxser_get_PCI_conf(int board_type, struct mxser_board *brd,
                 brd->ports[i].baud_base = 921600;
         }
         return 0;
+err_relio:
+        pci_release_region(pdev, 2);
+err:
+        return retval;
 }
 
 static int __init mxser_init(void)
@@ -3009,8 +3018,12 @@ static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
                 brd->nports = 8;
         else
                 brd->nports = 4;
-        request_region(brd->ports[0].ioaddr, 8 * brd->nports, "mxser(IO)");
-        request_region(brd->vector, 1, "mxser(vector)");
+        if (!request_region(brd->ports[0].ioaddr, 8 * brd->nports, "mxser(IO)"))
+                return MXSER_ERR_IOADDR;
+        if (!request_region(brd->vector, 1, "mxser(vector)")) {
+                release_region(brd->ports[0].ioaddr, 8 * brd->nports);
+                return MXSER_ERR_VECTOR;
+        }
         return brd->nports;
 }