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msf2: Remove dead code reported by Coverity

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Fixed incorrect frame size mask, validated maximum frame
size in spi_write and removed dead code.

Signed-off-by: Subbaraya Sundeep <sundeep.lkml@gmail.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Message-id: 1508898544-10307-1-git-send-email-sundeep.lkml@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Subbaraya Sundeep 2017-10-31 11:50:51 +00:00 committed by Peter Maydell
parent 0f2bf05ce7
commit cda607d5e0
1 changed files with 14 additions and 4 deletions
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18
hw/ssi/mss-spi.c
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@ -76,9 +76,10 @@
#define C_BIGFIFO (1 << 29)
#define C_RESET (1 << 31)
#define FRAMESZ_MASK 0x1F
#define FRAMESZ_MASK 0x3F
#define FMCOUNT_MASK 0x00FFFF00
#define FMCOUNT_SHIFT 8
#define FRAMESZ_MAX 32
static void txfifo_reset(MSSSpiState *s)
{
@ -104,10 +105,8 @@ static void set_fifodepth(MSSSpiState *s)
s->fifo_depth = 32;
} else if (size <= 16) {
s->fifo_depth = 16;
} else if (size <= 32) {
s->fifo_depth = 8;
} else {
s->fifo_depth = 4;
s->fifo_depth = 8;
}
}
@ -301,6 +300,17 @@ static void spi_write(void *opaque, hwaddr addr,
if (s->enabled) {
break;
}
/*
* [31:6] bits are reserved bits and for future use.
* [5:0] are for frame size. Only [5:0] bits are validated
* during write, [31:6] bits are untouched.
*/
if ((value & FRAMESZ_MASK) > FRAMESZ_MAX) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: Incorrect size %u provided."
"Maximum frame size is %u\n",
__func__, value & FRAMESZ_MASK, FRAMESZ_MAX);
break;
}
s->regs[R_SPI_DFSIZE] = value;
break;