From: Amitkumar Karwar <amit.karwar@xxxxxxxxxxxxxxxxxx>
Following kernel panic is observed on 64bit machine while loading
the driver. It is fixed if we pass dynamically allocated memory to
SDIO for DMA.
BUG: unable to handle kernel paging request at ffffeb04000172e0
IP: sg_miter_stop+0x56/0x70
PGD 0 P4D 0
Oops: 0000 [#1] SMP PTI
Modules linked in: rsi_sdio(OE+) rsi_91x(OE) btrsi(OE) rfcomm bluetooth
ecdh_generic mac80211 mmc_block fuse xt_CHECKSUM iptable_mangle
drm_kms_helper mmc_core serio_raw drm firewire_ohci tg3
CPU: 0 PID: 4003 Comm: insmod Tainted: G OE 4.16.0-rc1+ #27
Hardware name: Dell Inc. Latitude E5500 /0DW634, BIOS
A19 06/13/2013
RIP: 0010:sg_miter_stop+0x56/0x70
RSP: 0018:ffff88007d003e78 EFLAGS: 00010002
RAX: 0000000000000003 RBX: 0000000000000004 RCX: 0000000000000000
RDX: ffffeb04000172c0 RSI: ffff88002f58002c RDI: ffff88007d003e80
RBP: 0000000000000004 R08: ffff88007d003e80 R09: 0000000000000008
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000004
R13: ffff88002f580028 R14: 0000000000000000 R15: 0000000000000004
FS: 00007f35c29db700(0000) GS:ffff88007d000000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffeb04000172e0 CR3: 000000007038e000 CR4: 00000000000406f0
Call Trace:
<IRQ>
sg_copy_buffer+0xc6/0xf0
sdhci_tasklet_finish+0x170/0x260 [sdhci]
tasklet_action+0xf4/0x100
__do_softirq+0xef/0x26e
irq_exit+0xbe/0xd0
do_IRQ+0x4a/0xc0
common_interrupt+0xa2/0xa2
</IRQ>
Signed-off-by: Amitkumar Karwar <amit.karwar@xxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/rsi/rsi_91x_sdio.c | 32 +++++++++++++++++++++-----------
drivers/net/wireless/rsi/rsi_sdio.h | 2 ++
2 files changed, 23 insertions(+), 11 deletions(-)
diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c
index 9ce2edb..d76e69c 100644
--- a/drivers/net/wireless/rsi/rsi_91x_sdio.c
+++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c
@@ -653,11 +653,14 @@ static int rsi_sdio_master_reg_read(struct rsi_hw *adapter, u32 addr,
u32 *read_buf, u16 size)
{
u32 addr_on_bus, *data;
- u32 align[2] = {};
u16 ms_addr;
int status;
- data = PTR_ALIGN(&align[0], 8);
+ data = kzalloc(RSI_MASTER_REG_BUF_SIZE, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data = PTR_ALIGN(data, 8);
ms_addr = (addr >> 16);
status = rsi_sdio_master_access_msword(adapter, ms_addr);
@@ -665,7 +668,7 @@ static int rsi_sdio_master_reg_read(struct rsi_hw *adapter, u32 addr,
rsi_dbg(ERR_ZONE,
"%s: Unable to set ms word to common reg\n",
__func__);
- return status;
+ goto err;
}
addr &= 0xFFFF;
@@ -683,7 +686,7 @@ static int rsi_sdio_master_reg_read(struct rsi_hw *adapter, u32 addr,
(u8 *)data, 4);
if (status < 0) {
rsi_dbg(ERR_ZONE, "%s: AHB register read failed\n", __func__);
- return status;
+ goto err;
}
if (size == 2) {
if ((addr & 0x3) == 0)
@@ -705,17 +708,23 @@ static int rsi_sdio_master_reg_read(struct rsi_hw *adapter, u32 addr,
*read_buf = *data;
}
- return 0;
+err:
+ kfree(data);
+ return status;
}
static int rsi_sdio_master_reg_write(struct rsi_hw *adapter,
unsigned long addr,
unsigned long data, u16 size)
{
- unsigned long data1[2], *data_aligned;
+ unsigned long *data_aligned;
int status;
- data_aligned = PTR_ALIGN(&data1[0], 8);
+ data_aligned = kzalloc(RSI_MASTER_REG_BUF_SIZE, GFP_KERNEL);
+ if (!data_aligned)
+ return -ENOMEM;
+
+ data_aligned = PTR_ALIGN(data_aligned, 8);
if (size == 2) {
*data_aligned = ((data << 16) | (data & 0xFFFF));
@@ -734,6 +743,7 @@ static int rsi_sdio_master_reg_write(struct rsi_hw *adapter,
rsi_dbg(ERR_ZONE,
"%s: Unable to set ms word to common reg\n",
__func__);
+ kfree(data_aligned);
return -EIO;
}
addr = addr & 0xFFFF;
@@ -743,12 +753,12 @@ static int rsi_sdio_master_reg_write(struct rsi_hw *adapter,
(adapter,
(addr | RSI_SD_REQUEST_MASTER),
(u8 *)data_aligned, size);
- if (status < 0) {
+ if (status < 0)
rsi_dbg(ERR_ZONE,
"%s: Unable to do AHB reg write\n", __func__);
- return status;
- }
- return 0;
+
+ kfree(data_aligned);
+ return status;
}
/**
diff --git a/drivers/net/wireless/rsi/rsi_sdio.h b/drivers/net/wireless/rsi/rsi_sdio.h
index ba649be..ead8e7c 100644
--- a/drivers/net/wireless/rsi/rsi_sdio.h
+++ b/drivers/net/wireless/rsi/rsi_sdio.h
@@ -46,6 +46,8 @@ enum sdio_interrupt_type {
#define PKT_BUFF_AVAILABLE 1
#define FW_ASSERT_IND 2
+#define RSI_MASTER_REG_BUF_SIZE 12
+
#define RSI_DEVICE_BUFFER_STATUS_REGISTER 0xf3
#define RSI_FN1_INT_REGISTER 0xf9
#define RSI_INT_ENABLE_REGISTER 0x04
--
2.7.4
