ltq-adsl-mei: improve memory allocation

The ltq-adsl-mei driver allocates memory for the ADSL firmware in a
rather stupid way, leading to several 128k allocations, which fail when
many services are enabled. This patch tries to allocate 64 kiB chunks,
and only falls back to larger allocations if the returned pointers are
not correctly aligned. Fixes out-of-memory errors on Danube boards with
32 MiB RAM.

Signed-off-by: Matti Laakso <malaakso@elisanet.fi>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40325 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 44 insertions, 9 deletions

diff --git a/package/kernel/lantiq/ltq-adsl-mei/src/lantiq_mei.c b/package/kernel/lantiq/ltq-adsl-mei/src/lantiq_mei.c
index 443b9d90ac..561b300710 100644
--- a/package/kernel/lantiq/ltq-adsl-mei/src/lantiq_mei.c
+++ b/package/kernel/lantiq/ltq-adsl-mei/src/lantiq_mei.c
@@ -1513,13 +1513,31 @@ IFX_MEI_DFEMemoryAlloc (DSL_DEV_Device_t * pDev, long size)
                         allocate_size = size;
                 else
                         allocate_size = SDRAM_SEGMENT_SIZE;
-		org_mem_ptr = kmalloc (allocate_size + 1024, GFP_KERNEL);
+        
+		org_mem_ptr = kmalloc (allocate_size, GFP_KERNEL);
 		if (org_mem_ptr == NULL) {
                         IFX_MEI_EMSG ("%d: kmalloc %d bytes memory fail!\n", idx, allocate_size);
 			err = -ENOMEM;
 			goto allocate_error;
 		}
-                mem_ptr = (unsigned long) (org_mem_ptr + 1023) & ~(1024 -1);
+		
+		if (((unsigned long)org_mem_ptr) & (1023)) {
+			/* Pointer not 1k aligned, so free it and allocate a larger chunk
+			 * for further alignment.
+			 */
+			kfree(org_mem_ptr);
+			org_mem_ptr = kmalloc (allocate_size + 1024, GFP_KERNEL);
+			if (org_mem_ptr == NULL) {
+				IFX_MEI_EMSG ("%d: kmalloc %d bytes memory fail!\n",
+				              idx, allocate_size + 1024);
+				err = -ENOMEM;
+				goto allocate_error;
+			}
+			mem_ptr = (unsigned long) (org_mem_ptr + 1023) & ~(1024 -1);
+		} else {
+			mem_ptr = (unsigned long) org_mem_ptr;
+		}
+
                 adsl_mem_info[idx].address = (char *) mem_ptr;
                 adsl_mem_info[idx].org_address = org_mem_ptr;
                 adsl_mem_info[idx].size = allocate_size;
@@ -1591,6 +1609,7 @@ DSL_BSP_FWDownload (DSL_DEV_Device_t * pDev, const char *buf,
 
 	size_t nRead = 0, nCopy = 0;
 	char *mem_ptr;
+	char *org_mem_ptr = NULL;
 	ssize_t retval = -ENOMEM;
 	int idx = 0;
 
@@ -1634,17 +1653,33 @@ DSL_BSP_FWDownload (DSL_DEV_Device_t * pDev, const char *buf,
 		DSL_DEV_PRIVATE(pDev)->img_hdr =
 			(ARC_IMG_HDR *) adsl_mem_info[0].address;
 
-		adsl_mem_info[XDATA_REGISTER].org_address = kmalloc (SDRAM_SEGMENT_SIZE + 1024, GFP_KERNEL);
-		adsl_mem_info[XDATA_REGISTER].address =
-			(char *) ((unsigned long) (adsl_mem_info[XDATA_REGISTER].org_address + 1023) & 0xFFFFFC00);
-
-		adsl_mem_info[XDATA_REGISTER].size = SDRAM_SEGMENT_SIZE;
-
-		if (adsl_mem_info[XDATA_REGISTER].address == NULL) {
+		org_mem_ptr = kmalloc (SDRAM_SEGMENT_SIZE, GFP_KERNEL);
+		if (org_mem_ptr == NULL) {
 			IFX_MEI_EMSG ("kmalloc memory fail!\n");
 			retval = -ENOMEM;
 			goto error;
 		}
+		
+		if (((unsigned long)org_mem_ptr) & (1023)) {
+			/* Pointer not 1k aligned, so free it and allocate a larger chunk
+			 * for further alignment.
+			 */
+			kfree(org_mem_ptr);
+			org_mem_ptr = kmalloc (SDRAM_SEGMENT_SIZE + 1024, GFP_KERNEL);
+			if (org_mem_ptr == NULL) {
+				IFX_MEI_EMSG ("kmalloc memory fail!\n");
+				retval = -ENOMEM;
+				goto error;
+			}
+			adsl_mem_info[XDATA_REGISTER].address =
+				(char *) ((unsigned long) (org_mem_ptr + 1023) & ~(1024 -1));
+		} else {
+			adsl_mem_info[XDATA_REGISTER].address = org_mem_ptr;
+		}
+		
+		adsl_mem_info[XDATA_REGISTER].org_address = org_mem_ptr;
+		adsl_mem_info[XDATA_REGISTER].size = SDRAM_SEGMENT_SIZE;
+
 		adsl_mem_info[XDATA_REGISTER].type = FREE_RELOAD;
 		IFX_MEI_DMSG("-> IFX_MEI_BarUpdate()\n");
 		IFX_MEI_BarUpdate (pDev, (DSL_DEV_PRIVATE(pDev)->nBar));