V4L/DVB (13788): [Mantis CA] use a lock for the relevant CI Read/Write operations

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/media/dvb/mantis/mantis_hif.c b/drivers/media/dvb/mantis/mantis_hif.c
index 3368253aea6..b1e1aa0f5c1 100644
--- a/drivers/media/dvb/mantis/mantis_hif.c
+++ b/drivers/media/dvb/mantis/mantis_hif.c
@@ -92,6 +92,7 @@ int mantis_hif_read_mem(struct mantis_ca *ca, u32 addr)
         u32 hif_addr = 0, data, count = 4;
 
         dprintk(verbose, MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF Mem Read", mantis->num);
+        mutex_lock(&ca->ca_lock);
         hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
         hif_addr &= ~MANTIS_GPIF_PCMCIAIOM;
         hif_addr |=  MANTIS_HIF_STATUS;
@@ -104,9 +105,11 @@ int mantis_hif_read_mem(struct mantis_ca *ca, u32 addr)
 
         if (mantis_hif_sbuf_opdone_wait(ca) != 0) {
                 dprintk(verbose, MANTIS_ERROR, 1, "Adapter(%d) Slot(0): GPIF Smart Buffer operation failed", mantis->num);
+                mutex_unlock(&ca->ca_lock);
                 return -EREMOTEIO;
         }
         data = mmread(MANTIS_GPIF_DIN);
+        mutex_unlock(&ca->ca_lock);
         dprintk(verbose, MANTIS_DEBUG, 1, "Mem Read: 0x%02x", data);
         return (data >> 24) & 0xff;
 }
@@ -118,6 +121,7 @@ int mantis_hif_write_mem(struct mantis_ca *ca, u32 addr, u8 data)
         u32 hif_addr = 0;
 
         dprintk(verbose, MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF Mem Write", mantis->num);
+        mutex_lock(&ca->ca_lock);
         hif_addr &= ~MANTIS_GPIF_HIFRDWRN;
         hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
         hif_addr &= ~MANTIS_GPIF_PCMCIAIOM;
@@ -130,9 +134,11 @@ int mantis_hif_write_mem(struct mantis_ca *ca, u32 addr, u8 data)
 
         if (mantis_hif_write_wait(ca) != 0) {
                 dprintk(verbose, MANTIS_ERROR, 1, "Adapter(%d) Slot(0): HIF Smart Buffer operation failed", mantis->num);
+                mutex_unlock(&ca->ca_lock);
                 return -EREMOTEIO;
         }
         dprintk(verbose, MANTIS_DEBUG, 1, "Mem Write: (0x%02x to 0x%02x)", data, addr);
+        mutex_unlock(&ca->ca_lock);
 
         return 0;
 }
@@ -143,6 +149,7 @@ int mantis_hif_read_iom(struct mantis_ca *ca, u32 addr)
         u32 data, hif_addr = 0;
 
         dprintk(verbose, MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF I/O Read", mantis->num);
+        mutex_lock(&ca->ca_lock);
         hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
         hif_addr |=  MANTIS_GPIF_PCMCIAIOM;
         hif_addr |=  MANTIS_HIF_STATUS;
@@ -155,11 +162,13 @@ int mantis_hif_read_iom(struct mantis_ca *ca, u32 addr)
 
         if (mantis_hif_sbuf_opdone_wait(ca) != 0) {
                 dprintk(verbose, MANTIS_ERROR, 1, "Adapter(%d) Slot(0): HIF Smart Buffer operation failed", mantis->num);
+                mutex_unlock(&ca->ca_lock);
                 return -EREMOTEIO;
         }
         data = mmread(MANTIS_GPIF_DIN);
         dprintk(verbose, MANTIS_DEBUG, 1, "I/O Read: 0x%02x", data);
         udelay(50);
+        mutex_unlock(&ca->ca_lock);
 
         return (u8) data;
 }
@@ -170,6 +179,7 @@ int mantis_hif_write_iom(struct mantis_ca *ca, u32 addr, u8 data)
         u32 hif_addr = 0;
 
         dprintk(verbose, MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF I/O Write", mantis->num);
+        mutex_lock(&ca->ca_lock);
         hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
         hif_addr &= ~MANTIS_GPIF_HIFRDWRN;
         hif_addr |=  MANTIS_GPIF_PCMCIAIOM;
@@ -181,9 +191,11 @@ int mantis_hif_write_iom(struct mantis_ca *ca, u32 addr, u8 data)
 
         if (mantis_hif_write_wait(ca) != 0) {
                 dprintk(verbose, MANTIS_ERROR, 1, "Adapter(%d) Slot(0): HIF Smart Buffer operation failed", mantis->num);
+                mutex_unlock(&ca->ca_lock);
                 return -EREMOTEIO;
         }
         dprintk(verbose, MANTIS_DEBUG, 1, "I/O Write: (0x%02x to 0x%02x)", data, addr);
+        mutex_unlock(&ca->ca_lock);
         udelay(50);
 
         return 0;
@@ -201,6 +213,7 @@ int mantis_hif_init(struct mantis_ca *ca)
         init_waitqueue_head(&ca->hif_opdone_wq);
         init_waitqueue_head(&ca->hif_write_wq);
 
+        mutex_lock(&ca->ca_lock);
         irqcfg = mmread(MANTIS_GPIF_IRQCFG);
         irqcfg = MANTIS_MASK_BRRDY      |
                  MANTIS_MASK_WRACK      |
@@ -210,6 +223,7 @@ int mantis_hif_init(struct mantis_ca *ca)
                  MANTIS_MASK_OVFLW;
 
         mmwrite(irqcfg, MANTIS_GPIF_IRQCFG);
+        mutex_unlock(&ca->ca_lock);
 
         return 0;
 }
@@ -220,7 +234,9 @@ void mantis_hif_exit(struct mantis_ca *ca)
         u32 irqcfg;
 
         dprintk(verbose, MANTIS_ERROR, 1, "Adapter(%d) Exiting Mantis Host Interface", mantis->num);
+        mutex_lock(&ca->ca_lock);
         irqcfg = mmread(MANTIS_GPIF_IRQCFG);
         irqcfg &= ~MANTIS_MASK_BRRDY;
         mmwrite(irqcfg, MANTIS_GPIF_IRQCFG);
+        mutex_unlock(&ca->ca_lock);
 }
diff --git a/drivers/media/dvb/mantis/mantis_link.h b/drivers/media/dvb/mantis/mantis_link.h
index 599ff1b57e4..f9aaaa52f52 100644
--- a/drivers/media/dvb/mantis/mantis_link.h
+++ b/drivers/media/dvb/mantis/mantis_link.h
@@ -21,6 +21,7 @@
 #ifndef __MANTIS_LINK_H
 #define __MANTIS_LINK_H
 
+#include <linux/mutex.h>
 #include <linux/workqueue.h>
 #include "dvb_ca_en50221.h"
 
@@ -61,6 +62,7 @@ struct mantis_ca {
         void                            *ca_priv;
 
         struct dvb_ca_en50221           en50221;
+        struct mutex                    ca_lock;
 };
 
 /* CA */