From: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Reduce the static stack usage of one of the 2 top offenders as listed by
'make checkstack':
Building with CONFIG_FRAME_WARN=2048 produces:
drivers/media/dvb/frontends/dib3000mc.c:853: warning: the frame size of 2224 bytes is larger than 2048 bytes
and in 'make checkstack', the stack usage goes from:
0x00000bbd dib3000mc_i2c_enumeration [dib3000mc]: 2232
to unlisted with this patch.
Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Cc: Patrick Boettcher <pboettcher@xxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/media/dvb/frontends/dib3000mc.c | 35 +++++++++++++---------
1 file changed, 22 insertions(+), 13 deletions(-)
diff -puN drivers/media/dvb/frontends/dib3000mc.c~dib3000mc-reduce-large-stack-usage drivers/media/dvb/frontends/dib3000mc.c
--- a/drivers/media/dvb/frontends/dib3000mc.c~dib3000mc-reduce-large-stack-usage
+++ a/drivers/media/dvb/frontends/dib3000mc.c
@@ -814,42 +814,51 @@ EXPORT_SYMBOL(dib3000mc_set_config);
int dib3000mc_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib3000mc_config cfg[])
{
- struct dib3000mc_state st = { .i2c_adap = i2c };
+ struct dib3000mc_state *dmcst;
int k;
u8 new_addr;
static u8 DIB3000MC_I2C_ADDRESS[] = {20,22,24,26};
+ dmcst = kzalloc(sizeof(struct dib3000mc_state), GFP_KERNEL);
+ if (dmcst == NULL)
+ return -ENODEV;
+
+ dmcst->i2c_adap = i2c;
+
for (k = no_of_demods-1; k >= 0; k--) {
- st.cfg = &cfg[k];
+ dmcst->cfg = &cfg[k];
/* designated i2c address */
new_addr = DIB3000MC_I2C_ADDRESS[k];
- st.i2c_addr = new_addr;
- if (dib3000mc_identify(&st) != 0) {
- st.i2c_addr = default_addr;
- if (dib3000mc_identify(&st) != 0) {
+ dmcst->i2c_addr = new_addr;
+ if (dib3000mc_identify(dmcst) != 0) {
+ dmcst->i2c_addr = default_addr;
+ if (dib3000mc_identify(dmcst) != 0) {
dprintk("-E- DiB3000P/MC #%d: not identified\n", k);
+ kfree(dmcst);
return -ENODEV;
}
}
- dib3000mc_set_output_mode(&st, OUTMODE_MPEG2_PAR_CONT_CLK);
+ dib3000mc_set_output_mode(dmcst, OUTMODE_MPEG2_PAR_CONT_CLK);
// set new i2c address and force divstr (Bit 1) to value 0 (Bit 0)
- dib3000mc_write_word(&st, 1024, (new_addr << 3) | 0x1);
- st.i2c_addr = new_addr;
+ dib3000mc_write_word(dmcst, 1024, (new_addr << 3) | 0x1);
+ dmcst->i2c_addr = new_addr;
}
for (k = 0; k < no_of_demods; k++) {
- st.cfg = &cfg[k];
- st.i2c_addr = DIB3000MC_I2C_ADDRESS[k];
+ dmcst->cfg = &cfg[k];
+ dmcst->i2c_addr = DIB3000MC_I2C_ADDRESS[k];
- dib3000mc_write_word(&st, 1024, st.i2c_addr << 3);
+ dib3000mc_write_word(dmcst, 1024, dmcst->i2c_addr << 3);
/* turn off data output */
- dib3000mc_set_output_mode(&st, OUTMODE_HIGH_Z);
+ dib3000mc_set_output_mode(dmcst, OUTMODE_HIGH_Z);
}
+
+ kfree(dmcst);
return 0;
}
EXPORT_SYMBOL(dib3000mc_i2c_enumeration);
_
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