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i2c: pm_smbus: Make the I2C block read command read-only 

It did have write capability, but the manual says the behavior
with write enabled is undefined.  So just set an error in this
case.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1534796770-10295-4-git-send-email-minyard@acm.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Corey Minyard 2018-08-20 15:26:03 -05:00 committed by Paolo Bonzini
parent 4b615be540
commit 00bdfeab15
1 changed files with 4 additions and 5 deletions
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9
hw/i2c/pm_smbus.c
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@ -55,7 +55,7 @@
#define PROT_WORD_DATA 3 #define PROT_WORD_DATA 3
#define PROT_PROC_CALL 4 #define PROT_PROC_CALL 4
#define PROT_BLOCK_DATA 5 #define PROT_BLOCK_DATA 5
#define PROT_I2C_BLOCK_DATA 6 #define PROT_I2C_BLOCK_READ 6
/*#define DEBUG*/ /*#define DEBUG*/
@ -115,7 +115,7 @@ static void smb_transaction(PMSMBus *s)
goto done; goto done;
} }
break; break;
case PROT_I2C_BLOCK_DATA: case PROT_I2C_BLOCK_READ:
if (read) { if (read) {
int xfersize = s->smb_data0; int xfersize = s->smb_data0;
if (xfersize > sizeof(s->smb_data)) { if (xfersize > sizeof(s->smb_data)) {
@ -125,9 +125,8 @@ static void smb_transaction(PMSMBus *s)
xfersize, false, true); xfersize, false, true);
goto data8; goto data8;
} else { } else {
ret = smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0, /* The manual says the behavior is undefined, just set DEV_ERR. */
false); goto error;
goto done;
} }
break; break;
default: default: