Out of the three callers once insists on the scratch buffer, and the
others are fine with a new allocation. Switch those two to juse use
pci_alloc_consistent directly, and open code the scratch buffer
allocation in the remaining one. This avoids a case where we might
be doing a memory allocation under a spinlock with irqs disabled.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/scsi/gdth.c | 7 ++--
drivers/scsi/gdth_proc.c | 71 ++++++++++++----------------------------
drivers/scsi/gdth_proc.h | 3 --
3 files changed, 25 insertions(+), 56 deletions(-)
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 2bec840018ad..7274d09b2a6c 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -4232,7 +4232,7 @@ static int ioc_general(void __user *arg, char *cmnd)
gdth_ioctl_general gen;
gdth_ha_str *ha;
char *buf = NULL;
- u64 paddr;
+ dma_addr_t paddr;
int rval;
if (copy_from_user(&gen, arg, sizeof(gdth_ioctl_general)))
@@ -4251,7 +4251,8 @@ static int ioc_general(void __user *arg, char *cmnd)
if (gen.data_len + gen.sense_len == 0)
goto execute;
- buf = gdth_ioctl_alloc(ha, gen.data_len + gen.sense_len, FALSE, &paddr);
+ buf = pci_alloc_consistent(ha->pdev, gen.data_len + gen.sense_len,
+ &paddr);
if (!buf)
return -EFAULT;
@@ -4291,7 +4292,7 @@ static int ioc_general(void __user *arg, char *cmnd)
rval = 0;
out_free_buf:
- gdth_ioctl_free(ha, gen.data_len+gen.sense_len, buf, paddr);
+ pci_free_consistent(ha->pdev, gen.data_len + gen.sense_len, buf, paddr);
return 0;
}
diff --git a/drivers/scsi/gdth_proc.c b/drivers/scsi/gdth_proc.c
index 63d851398e38..6a6bdab748df 100644
--- a/drivers/scsi/gdth_proc.c
+++ b/drivers/scsi/gdth_proc.c
@@ -31,7 +31,6 @@ static int gdth_set_asc_info(struct Scsi_Host *host, char *buffer,
int i, found;
gdth_cmd_str gdtcmd;
gdth_cpar_str *pcpar;
- u64 paddr;
char cmnd[MAX_COMMAND_SIZE];
memset(cmnd, 0xff, 12);
@@ -113,13 +112,23 @@ static int gdth_set_asc_info(struct Scsi_Host *host, char *buffer,
}
if (wb_mode) {
- if (!gdth_ioctl_alloc(ha, sizeof(gdth_cpar_str), TRUE, &paddr))
- return(-EBUSY);
+ unsigned long flags;
+
+ BUILD_BUG_ON(sizeof(gdth_cpar_str) > GDTH_SCRATCH);
+
+ spin_lock_irqsave(&ha->smp_lock, flags);
+ if (ha->scratch_busy) {
+ spin_unlock_irqrestore(&ha->smp_lock, flags);
+ return -EBUSY;
+ }
+ ha->scratch_busy = TRUE;
+ spin_unlock_irqrestore(&ha->smp_lock, flags);
+
pcpar = (gdth_cpar_str *)ha->pscratch;
memcpy( pcpar, &ha->cpar, sizeof(gdth_cpar_str) );
gdtcmd.Service = CACHESERVICE;
gdtcmd.OpCode = GDT_IOCTL;
- gdtcmd.u.ioctl.p_param = paddr;
+ gdtcmd.u.ioctl.p_param = ha->scratch_phys;
gdtcmd.u.ioctl.param_size = sizeof(gdth_cpar_str);
gdtcmd.u.ioctl.subfunc = CACHE_CONFIG;
gdtcmd.u.ioctl.channel = INVALID_CHANNEL;
@@ -127,7 +136,10 @@ static int gdth_set_asc_info(struct Scsi_Host *host, char *buffer,
gdth_execute(host, &gdtcmd, cmnd, 30, NULL);
- gdth_ioctl_free(ha, GDTH_SCRATCH, ha->pscratch, paddr);
+ spin_lock_irqsave(&ha->smp_lock, flags);
+ ha->scratch_busy = FALSE;
+ spin_unlock_irqrestore(&ha->smp_lock, flags);
+
printk("Done.\n");
return(orig_length);
}
@@ -143,7 +155,7 @@ int gdth_show_info(struct seq_file *m, struct Scsi_Host *host)
int id, i, j, k, sec, flag;
int no_mdrv = 0, drv_no, is_mirr;
u32 cnt;
- u64 paddr;
+ dma_addr_t paddr;
int rc = -ENOMEM;
gdth_cmd_str *gdtcmd;
@@ -232,7 +244,7 @@ int gdth_show_info(struct seq_file *m, struct Scsi_Host *host)
seq_puts(m, "\nPhysical Devices:");
flag = FALSE;
- buf = gdth_ioctl_alloc(ha, size, FALSE, &paddr);
+ buf = pci_alloc_consistent(ha->pdev, size, &paddr);
if (!buf)
goto stop_output;
for (i = 0; i < ha->bus_cnt; ++i) {
@@ -408,7 +420,7 @@ int gdth_show_info(struct seq_file *m, struct Scsi_Host *host)
seq_printf(m,
" To Array Drv.:\t%s\n", hrec);
}
-
+
if (!flag)
seq_puts(m, "\n --\n");
@@ -502,7 +514,7 @@ int gdth_show_info(struct seq_file *m, struct Scsi_Host *host)
}
}
}
- gdth_ioctl_free(ha, size, buf, paddr);
+ pci_free_consistent(ha->pdev, size, buf, paddr);
for (i = 0; i < MAX_HDRIVES; ++i) {
if (!(ha->hdr[i].present))
@@ -555,47 +567,6 @@ int gdth_show_info(struct seq_file *m, struct Scsi_Host *host)
return rc;
}
-static char *gdth_ioctl_alloc(gdth_ha_str *ha, int size, int scratch,
- u64 *paddr)
-{
- unsigned long flags;
- char *ret_val;
-
- if (size == 0)
- return NULL;
-
- spin_lock_irqsave(&ha->smp_lock, flags);
-
- if (!ha->scratch_busy && size <= GDTH_SCRATCH) {
- ha->scratch_busy = TRUE;
- ret_val = ha->pscratch;
- *paddr = ha->scratch_phys;
- } else if (scratch) {
- ret_val = NULL;
- } else {
- dma_addr_t dma_addr;
-
- ret_val = pci_alloc_consistent(ha->pdev, size, &dma_addr);
- *paddr = dma_addr;
- }
-
- spin_unlock_irqrestore(&ha->smp_lock, flags);
- return ret_val;
-}
-
-static void gdth_ioctl_free(gdth_ha_str *ha, int size, char *buf, u64 paddr)
-{
- unsigned long flags;
-
- if (buf == ha->pscratch) {
- spin_lock_irqsave(&ha->smp_lock, flags);
- ha->scratch_busy = FALSE;
- spin_unlock_irqrestore(&ha->smp_lock, flags);
- } else {
- pci_free_consistent(ha->pdev, size, buf, paddr);
- }
-}
-
#ifdef GDTH_IOCTL_PROC
static int gdth_ioctl_check_bin(gdth_ha_str *ha, u16 size)
{
diff --git a/drivers/scsi/gdth_proc.h b/drivers/scsi/gdth_proc.h
index d7d0aa283695..4cc5377cb92e 100644
--- a/drivers/scsi/gdth_proc.h
+++ b/drivers/scsi/gdth_proc.h
@@ -12,9 +12,6 @@ int gdth_execute(struct Scsi_Host *shost, gdth_cmd_str *gdtcmd, char *cmnd,
static int gdth_set_asc_info(struct Scsi_Host *host, char *buffer,
int length, gdth_ha_str *ha);
-static char *gdth_ioctl_alloc(gdth_ha_str *ha, int size, int scratch,
- u64 *paddr);
-static void gdth_ioctl_free(gdth_ha_str *ha, int size, char *buf, u64 paddr);
static void gdth_wait_completion(gdth_ha_str *ha, int busnum, int id);
#endif
--
2.19.1
