Openmoko Bug #1971: keep retrieving all SMS list even there is no message in SIM

[Openmoko Public Trac]

#1971: keep retrieving all SMS list even there is no message in SIM
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 Reporter:  erin_yueh  |          Owner:  zecke        
     Type:  defect     |         Status:  new          
 Priority:  normal     |      Milestone:  Om2008.9     
Component:  unknown    |        Version:  Om2008.8     
 Severity:  normal     |       Keywords:  sms, hasPatch
Blockedby:             |   Reproducible:  always       
 Blocking:             |  
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 check the attached log file and you can find it tries to send 'AT+CMGL=4'
 too many times. If there is no SMS in SIM card, we needn't send this AT
 command to modem.

 please review this patch, it can avoid to keep sending this AT command.

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Ticket URL: <https://docs.openmoko.org/trac/ticket/1971>
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