Hello all,
The following patch swaps a save_flags/cli/restore_flags combo with a
spinlock. Please review.
Regards,
Frank
--- linux/drivers/char/ftape/lowlevel/fdc-io.c.old Sat Oct 19 12:04:19 2002
+++ linux/drivers/char/ftape/lowlevel/fdc-io.c Sat Dec 28 21:28:17 2002
@@ -39,14 +39,14 @@
#include <linux/ftape.h>
#include <linux/qic117.h>
-#include "../lowlevel/ftape-tracing.h"
-#include "../lowlevel/fdc-io.h"
-#include "../lowlevel/fdc-isr.h"
-#include "../lowlevel/ftape-io.h"
-#include "../lowlevel/ftape-rw.h"
-#include "../lowlevel/ftape-ctl.h"
-#include "../lowlevel/ftape-calibr.h"
-#include "../lowlevel/fc-10.h"
+#include "ftape-tracing.h"
+#include "fdc-io.h"
+#include "fdc-isr.h"
+#include "ftape-io.h"
+#include "ftape-rw.h"
+#include "ftape-ctl.h"
+#include "ftape-calibr.h"
+#include "fc-10.h"
/* Global vars.
*/
@@ -84,19 +84,19 @@
static __u8 fdc_prec_code; /* fdc precomp. select code */
static char ftape_id[] = "ftape"; /* used by request irq and free irq */
+static fdc_io_lock = SPIN_LOCK_UNLOCKED;
void fdc_catch_stray_interrupts(int count)
{
unsigned long flags;
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&fdc_io_lock, flags);
if (count == 0) {
ft_expected_stray_interrupts = 0;
} else {
ft_expected_stray_interrupts += count;
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
}
/* Wait during a timeout period for a given FDC status.
@@ -194,8 +194,7 @@
TRACE_FUN(ft_t_any);
fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&fdc_io_lock, flags);
#if LINUX_VERSION_CODE >= KERNEL_VER(2,1,30)
if (!in_interrupt())
#else
@@ -223,7 +222,7 @@
* "fdc_read timeout" errors, I HOPE :-)
*/
if (ft_hide_interrupt) {
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE(ft_t_info,
"Waiting for the isr() completing fdc_seek()");
if (fdc_interrupt_wait(2 * FT_SECOND) < 0) {
@@ -246,12 +245,11 @@
}
fdc_usec_wait(FT_RQM_DELAY); /* wait for valid RQM status */
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&fdc_io_lock, flags);
}
fdc_status = inb(fdc.msr);
if ((fdc_status & FDC_DATA_READY_MASK) != FDC_DATA_IN_READY) {
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_ABORT(-EBUSY, ft_t_err, "fdc not ready");
}
fdc_mode = *cmd_data; /* used by isr */
@@ -301,7 +299,7 @@
last_time = ftape_timestamp();
}
#endif
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_EXIT result;
}
@@ -317,15 +315,14 @@
int retry = 0;
TRACE_FUN(ft_t_any);
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&fdc_lock, flags);
fdc_status = inb(fdc.msr);
if ((fdc_status & FDC_DATA_READY_MASK) != FDC_DATA_OUT_READY) {
TRACE(ft_t_err, "fdc not ready");
result = -EBUSY;
} else while (count) {
if (!(fdc_status & FDC_BUSY)) {
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_ABORT(-EIO, ft_t_err, "premature end of result phase");
}
result = fdc_read(res_data);
@@ -348,7 +345,7 @@
++res_data;
}
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
fdc_usec_wait(FT_RQM_DELAY); /* allow FDC to negate BSY */
TRACE_EXIT result;
}
@@ -627,8 +624,7 @@
unsigned long flags;
TRACE_FUN(ft_t_any);
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&fdc_io_lock, flags);
fdc_dor_reset(1); /* keep unit selected */
@@ -647,7 +643,7 @@
*/
fdc_update_dsr(); /* restore data rate and precomp */
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
/*
* Wait for first polling cycle to complete
@@ -946,16 +942,15 @@
*/
TRACE(ft_t_fdc_dma,
"phys. addr. = %lx", virt_to_bus((void*) buff->ptr));
- save_flags(flags);
- cli(); /* could be called from ISR ! */
+ spin_lock_irqsave(&fdc_lock, flags);
fdc_setup_dma(DMA_MODE_WRITE, buff->ptr, FT_SECTORS_PER_SEGMENT * 4);
/* Issue FDC command to start reading/writing.
*/
out[1] = ft_drive_sel;
out[4] = buff->gap3;
TRACE_CATCH(fdc_setup_error = fdc_command(out, sizeof(out)),
- restore_flags(flags); fdc_mode = fdc_idle);
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags); fdc_mode = fdc_idle);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_EXIT 0;
}
@@ -998,8 +993,7 @@
ft_t_bug, "bug: illegal operation parameter");
}
TRACE(ft_t_fdc_dma, "phys. addr. = %lx",virt_to_bus((void*)buff->ptr));
- save_flags(flags);
- cli(); /* could be called from ISR ! */
+ spin_lock_irqsave(&fdc_io_lock, flags);
if (operation != FDC_VERIFY) {
fdc_setup_dma(dma_mode, buff->ptr,
FT_SECTOR_SIZE * buff->sector_count);
@@ -1017,7 +1011,7 @@
out[8] = 0xff; /* No limit to transfer size. */
TRACE(ft_t_fdc_dma, "C: 0x%02x, H: 0x%02x, R: 0x%02x, cnt: 0x%02x",
out[2], out[3], out[4], out[6] - out[4] + 1);
- restore_flags(flags);
+ spin_unlock_irqrestore(&fdc_io_lock, flags);
TRACE_CATCH(fdc_setup_error = fdc_command(out, 9),fdc_mode = fdc_idle);
TRACE_EXIT 0;
}
-
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This archive was generated by hypermail 2b29 : Tue Dec 31 2002 - 22:00:13 EST