powerpc: fix memory leaks in QE library

Fix two memory leaks in the Freescale QE library: add a missing kfree() in
ucc_fast_init() and ucc_slow_init() if the ioremap() fails, and update
ucc_fast_free() and ucc_slow_free() to call iounmap() if necessary.

Based on a patch from Tony Breeds <tony@bakeyournoodle.com>.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 9 insertions, 3 deletions

diff --git a/arch/powerpc/sysdev/qe_lib/ucc_fast.c b/arch/powerpc/sysdev/qe_lib/ucc_fast.c
index 1aecb075a72..25fbbfaa837 100644
--- a/arch/powerpc/sysdev/qe_lib/ucc_fast.c
+++ b/arch/powerpc/sysdev/qe_lib/ucc_fast.c
@@ -208,6 +208,7 @@ int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** ucc
         uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
         if (uccf->uf_regs == NULL) {
                 printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
+                kfree(uccf);
                 return -ENOMEM;
         }
 
@@ -355,6 +356,9 @@ void ucc_fast_free(struct ucc_fast_private * uccf)
         if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
                 qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);
 
+        if (uccf->uf_regs)
+                iounmap(uccf->uf_regs);
+
         kfree(uccf);
 }
 EXPORT_SYMBOL(ucc_fast_free);
diff --git a/arch/powerpc/sysdev/qe_lib/ucc_slow.c b/arch/powerpc/sysdev/qe_lib/ucc_slow.c
index a578bc77b9d..e1d6a134015 100644
--- a/arch/powerpc/sysdev/qe_lib/ucc_slow.c
+++ b/arch/powerpc/sysdev/qe_lib/ucc_slow.c
@@ -171,6 +171,7 @@ int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** ucc
         uccs->us_regs = ioremap(us_info->regs, sizeof(struct ucc_slow));
         if (uccs->us_regs == NULL) {
                 printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
+                kfree(uccs);
                 return -ENOMEM;
         }
 
@@ -367,10 +368,11 @@ void ucc_slow_free(struct ucc_slow_private * uccs)
         if (uccs->tx_base_offset)
                 qe_muram_free(uccs->tx_base_offset);
 
-        if (uccs->us_pram) {
+        if (uccs->us_pram)
                 qe_muram_free(uccs->us_pram_offset);
-                uccs->us_pram = NULL;
-        }
+
+        if (uccs->us_regs)
+                iounmap(uccs->us_regs);
 
         kfree(uccs);
 }